Number rounding
Always use a consistent level of precision, but use the lowest level possible for the intended user.
For the “inquiring citizen”, that is, a broader, less statistical audience :
260,000
For the “information forager”, for example, a local politician making decisions about future council tax charges:
264,300
For the “expert analyst”, for example, in a statistical journal discussing the detailed methodology behind the estimation, or in a situation where reproducibility is important:
264,337